ai-agent-book 精选快照（<2MB 代码与文档，来自 github.com/bojieli/ai-agent-book）

.env.example

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+# Copy to .env at the repository root for shared provider-aware chapter CLIs.
+# Some experiments load an adjacent .env or expect exported environment vars;
+# follow the experiment README when it gives narrower setup instructions.
+#
+#     cp .env.example .env
+#
+# Set whichever provider you actually use -- you do not need all of them.
+
+# --- zero-cost options -------------------------------------------------------
+
+# 1. OpenRouter with a free model. Runs on OpenRouter's servers, so any laptop
+#    works. Model ids ending in ':free' cost nothing.
+# Uncomment and paste your key after `=`.
+# OPENROUTER_API_KEY=
+OPENROUTER_MODEL=google/gemma-4-31b-it:free
+
+# 2. Ollama. Fully local, no key and no network, but needs enough RAM to hold
+#    the model. Use `--provider ollama` in the chapter CLIs.
+# OLLAMA_BASE_URL=http://localhost:11434/v1
+
+# --- direct provider keys ----------------------------------------------------
+# Any one of these is enough; the chapter picks a provider and falls back to
+# OpenRouter when that provider's key is absent.
+
+# Moonshot / Kimi -- required for chapter 1's live $web_search experiment,
+# which OpenRouter cannot substitute.
+# MOONSHOT_API_KEY=your-moonshot-key
+
+# ByteDance Doubao (Volcano Engine)
+# ARK_API_KEY=your-ark-key
+
+# SiliconFlow (Qwen)
+# SILICONFLOW_API_KEY=your-siliconflow-key
+
+# Alibaba Cloud Model Studio / Bailian (Qwen)
+# Mainland-region key:
+# DASHSCOPE_API_KEY=your-dashscope-key
+# International-region key (use this endpoint with an international key):
+# DASHSCOPE_BASE_URL=https://dashscope-intl.aliyuncs.com/compatible-mode/v1
+
+# DeepSeek
+# DEEPSEEK_API_KEY=your-deepseek-key
+# DEEPSEEK_BASE_URL=https://api.deepseek.com
+
+# Zhipu (GLM)
+# ZHIPU_API_KEY=your-zhipu-key
+
+# OpenAI
+# OPENAI_API_KEY=your-openai-api-key
+
+# Google Gemini (has a free tier)
+# GEMINI_API_KEY=your-gemini-key